Mail not getting delivered to user

UNIX for Advanced & Expert Users
1

Hi,

There is a unix box in production from which mails will be sent to user/group. From this box, many mails will be sent. But only for one mail which is sent from the box, it is showing a message like "Deferred: 421 Microsoft ESMTP MAIL Service, Version: 6.0.3790.4675 ready at Service not available, closing transmission channel". Can any one tell me the reason what may be the problem with this? Has the mail reached Exchange server? Or before reaching exchange server itself it failed? I am not sure. Can any one plz help

Thanks and Regards,
Selvaraj S

2

Could you please let us know a bit more about your environment first? What UNIX variant you are using, which SMTP server, etc. etc.

3

Hi Environment is AIX and I am using the below command to send the mail "mail -s "$MAIL_SUBJ" $i"